The school held a skipping competition. Two girls were selected from three girls, and 1 of the boys were selected from two boys to participate in the competition. How many ways are there? Why?

There are six ways to choose. For example, if three girls are A, B and C, there are three combinations when choosing two girls from three girls, namely AB, AC and BC. The two boys are A and B, so if boys and girls are combined together, they are AB A, AB B, AC A, AB B, BC A and BC B.